The advantage of 'hobbyists' is that they tend to be very friendly, and not at all antagonistic towards others around them.
With a good background of bumblebees and other insects around, and research done by the PGRO showing 80%+ pollination of beans done without insects at all, a couple of permanent hives here and there on a normal arable farm are a great asset, but only if it's convenient for everyone.
With a lot of legumes tis true tho one would assume as a farmer you would want to maximise yield ! and the honeybee you can manage and target pollination